Engine Air Intake Bypass Valve Sealing
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Solution Overview
Problem
Conventional air intake devices for engines suffer from gaps between the valve body and valve chamber, leading to leakage and inaccurate control of bypass air intake volume, especially when the valve is fully closed or at low opening, due to the cylindrical shapes of the inner and outer faces.
Innovation Solution
The air intake device features specific shaped faces on the valve chamber and valve body to ensure intimate contact at one portion and a gap at others, allowing precise control of the bypass air intake volume while preventing leakage, with options including cylindrical, arc-shaped, or planar faces to facilitate smooth sliding and accurate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve body is made to slide in the valve chamber with a slightly smaller outer radius than the inner radius of the valve chamber, then smooth sliding is enabled, but gaps form between the valve body and valve chamber inner face, causing air leakage and inaccurate control of bypass air intake volume
Solution Approach 1:
The invention applies different geometric characteristics to different portions of the valve body and valve chamber. Specifically, one portion of the inner face of the valve chamber and the opposing outer face of the valve body are formed in the same shape (both cylindrical or both arc-shaped with matching radii) to enable intimate contact and prevent leakage, while other portions are intentionally displaced to maintain a gap for smooth sliding operation.
2Adaptability or versatility
If the opening area of the metering hole is set large, then bypass air intake control range is improved, but air leakage through gaps becomes more significant, causing deviation in controlled air intake volume
Solution Approach 1:
The invention ensures that the portion of the valve body covering the metering hole is precisely shaped to match the valve chamber inner face, creating an intimate contact seal exactly where needed (at the metering hole opening) to prevent leakage, while allowing the valve body to maintain its sliding capability in other regions.
3Reliability
If the valve body is drawn toward the metering hole side due to air intake negative pressure, then sealing at the metering hole is improved, but the valve body cannot maintain intimate contact with the entire inner side face of the valve chamber, creating gaps at opposite ends
Solution Approach 1:
The invention creates an asymmetric configuration where the valve body and valve chamber have matching shapes only at the critical sealing portion (one portion of the inner face and opposing outer face), while intentionally creating asymmetry (gap) at other portions. This allows the valve body to be drawn toward the metering hole for sealing while maintaining sliding capability through the intentional gap regions.
Data Source
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AI summary
An air intake device for an engine is provided that includes a bypass (20) connected to an air intake path (2) while bypassing a throttle valve (5), and a bypass valve (V) for controlling the degree of opening of the bypass (20), the bypass valve (V) being formed from a tubular valve chamber (15) having its interior opening on the upstream side of the bypass (20) and having an inner face with a metering hole (16) opening toward the downstream side of the bypass (20), and a valve body (25) slidably but non-rotatably fitted into the valve chamber (15) and opening and closing the metering hole (16), wherein an inner face (A) of the valve chamber (15) on which the metering hole (16) opens and an outer face (B1) of the valve body (25) opposing the inner face (A) and covering the metering hole (16) are formed in the same shape so as to enable them to be in intimate contact with each other, and other inner (A) and outer faces (B2) of the valve chamber (15) and the valve body (25) are formed so that there is a gap (g) therebetween. This enables the valve body to be reliably in intimate contact with the inner side face of the valve chamber on which the metering hole opens while guaranteeing smooth sliding of the valve body in the valve chamber in the bypass, thus preventing leaked air from flowing into the metering hole.